Montage- und Bedienungsanleitung
Assembly and operating instructions
Notice de montage et d´utilisation
Hot Shot
No. 3078
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8
Hot Shot
3078
Building instructions Order No.
Specification
Wingspan: approx. 1530 mm
Total flying surface area: approx. 33 dm
2
All-up weight, glider: approx. 650 g
All-up weight incl. power system: approx. 900 g
Wing section: E 186 mod.
Please see separate sheet for details of essential items not
included in the kit.
Refer to the main robbe catalogue for details of tools and
aids to building.
Sequence of assembly
In general terms the part numbers correspond to the sequence
of assembly; the number before the point indicates the Stage of
construction, the number after the point the individual compo-
nent.
Study the plan, the building instructions and the parts list before
starting construction, so that you have a clear idea at the outset
how the model goes together.
In the centre of these instructions you will find eight pages with
stage drawings. Pull the drawings out for reference.
The identification drawings „O“ is intended to help you locate
and identify the die-cut parts.
Write the part numbers on the die-cut parts, but do not separate
them from their sheets until they are needed. Clean up cut
edges carefully.
Where die-cut parts have to be glued together always be sure
to leave the punched points exposed, as they indicate hole
positions. The instructions tell you when to drill the holes.
Some parts, such as the strip wood, have to be cut to length
according to the plan. The instructions don’t mention this in
detail every time.
Please read the instructions supplied by the various adhesive
manufacturers. Allow glued joints to harden fully before con-
tinuing with construction.
Wherever epoxy is used remember to wipe off excess glue
while it is still soft.
All metal parts, such as pushrods, nuts etc., should be cleaned
and de-greased before installation.
When gluing nuts to wooden parts take care to keep the glue out
of the threaded section.
Directions such as „right-hand“ are as seen from the tail of
the model looking forward.
Radio control system
For the Hot Shot you need a radio control system with a dual
mixer designed for a V-tail. A low-profile (flat-pack) receiver
battery is also required.
Please check that your RC system components will fit in the
positions recommended before you start building the model.
If you intend to use a radio control system other than the one we
recommend, you can still the follow the basic arrangement
shown, but you may need to make minor changes to allow for
differences in component size.
Before you start construction set the servos to neutral from the
transmitter (transmitter sticks and trims central).
Installing the RC system
In its standard form this model’s receiving system components
are installed permanently in the wing.
If you wish to have access to these components you can
incorporate a removable hatch in the top sheeting. Details of
this are left up to the builder. In this case you will need open the
centre ribs to allow the battery to be fitted and removed.
The motor
For flat-field flying the model can be flown with an auxiliary
motor, mounted on a suitable pylon, for self-launching. The
motor is operated in non-throttled mode.
The materials for the motor pylon base are included in the kit.
The Order Nos. for the other parts required are listed on a
separate sheet.
Aero-tow release
An aero-tow release can be installed; details of the installation
are left up to the builder. Note that there is only space for a mini-
servo for this function.
Covering
We recommend robbe heat-shrink film for covering the model;
the film is supplied with full instructions. Please note that the
wooden parts must not be doped or sealed before the film is
applied. Simply rub down the wooden surfaces lightly with fine
glasspaper and remove all traces of sanding dust.
You can copy the colour scheme shown in the kit box illustration
if you wish.
The plans
The wing is built directly over the full-size drawing. The plan
should be taped down on a completely straight, flat building
board.
Cover the relevant area of the plans with thin clear household
film to avoid the parts sticking to the paper.
9
Hot Shot
3078
Building instructions Order No.
Building the model
Stage 1, the basic wing structure, parts 1.1 - 1.13
Part No. Description Material Dimensions in mm No. off Notes
1.1 Bottom sheeting Balsa 1.5 2
1.2 Bottom spar Spruce 3 x 7 x 850 2
1.3 Root rib Plywood 3 die-cut parts 2
1.4-1.9 Wingrib Balsa 2, die-cut 2 each
1.10 Tip rib Plywood 3, die-cut 2
1.11 Trailing edge Balsa 6:4.5 x 8.5 x 820 2 each Asymm. taper
1.12 Bottom T.E. sheeting Balsa 1.5 x 15 x 820 2
1.13 Top mainspar Spruce 3 x 7 x 850 2
Note: it is not absolutely essential to glue the ribs to the bottom
sheeting over the plan (building board), provided that you mark
the rib positions accurately on the sheeting beforehand.
The instructions describe the construction of one wing panel.
The second panel is built in exactly the same sequence, but as
a mirror-image of the first.
- Mark the position of the ribs on the bottom sheeting 1.1 as
shown on the plan.
- Glue the bottom mainspar 1.2 to the bottom sheeting 1.1 flush
with the rear edge.
- Glue the root rib 1.3 and ribs 1.4 - 1.10 to the bottom
mainspar; check that they are exactly at right-angles when
viewed from the front.
- Ensure that the ribs make good contact with the bottom
sheeting. If necessary pin the ribs down to the sheeting until
the glue has set hard.
- Glue the trailing edge 1.11 to the trailing edge sheeting 1.12.
Check that the trailing edge strip is the right way up, as it is
not symmetrical, as shown in the detail drawing "Z".
- The following steps must be carried out directly on the
building board (plan).
- Pin down the assembled trailing edge 1.11, 1.12 over the
plan, leaving an equal overhang at right and left.
- Place the wing framework against it and glue the ribs in place.
- Pin down the bottom mainspar on the building board and glue
the top mainspar 1.13 in place. Check that the root rib 1.3 is
at right-angles to the bottom mainspar 1.2 - detail drawing
"Y".
- Remove the wing framework and sand the projecting parts
back flush with the outside shape of the ribs 1.3 and 1.10.
Stage 2, the basic wing structure, parts 2.1 - 2.8, HL
Part No. Description Material Dimensions in mm No. off Notes
„HL“ Jig strip Balsa 3 x 3 x 850 2
2.1 Outside doubler Plywood 3, die-cut 2
2.2 Centre doubler Plywood 3, die-cut 2
2.3 Top T.E. sheeting Balsa 1.5 x 15 x 820 2
2.4 Battery former Plywood 3, die-cut 2
2.5 Half-rib Plywood 3, die-cut 2
2.6 Spar webbing Balsa 1.5, overlength 24
2.7 Top sheeting Balsa 1.5 x 59 x 800 2
2.8 Leading edge Balsa 9 x 14 x 890 2
- Pin down the jig strip „HL“ over the plan, flush with the line of
the trailing edge strip.
- Place the wing structure over the plan and pin it to the building
board and the jig strip „HL“.
- Glue the doublers 2.1 and 2.2 to the ribs 1.3 and 1.10.
- Glue the top trailing edge sheeting 2.3 in place and cut off the
excess length.
- Glue together the battery former 2.4 and the half-rib 2.5 at
right-angles. Check that the half-rib 2.5 follows the wing
section correctly.
- Glue this assembly in place flush with the front edge of the
bottom sheeting. Use the extended lines on the plan as a
guide.
- Each of the spar webs 2.6 consists of two parts with the wood
grain vertical. Trim them to fit between the ribs 1.4 - 1.10 and
glue them in place. Do not fit webbing in the bay between ribs
1.3 and 1.4.
- Check carefully that the wing is resting squarely on the
building board. Glue the top sheeting 2.7 to the structure and
pin it in place.
- Allow the glue to set hard, then remove the wing from the
board. Sand back the ribs and the excess sheeting material
at the front face of the wing until you achieve a completely flat
surface for the leading edge.
- Glue the leading edge 2.8 to the wing.
- Sand the leading edge flush with the root and tip ribs and sand
to the proper section as shown on the plan.
10
Hot Shot
3078
Building instructions Order No.
Stage 3, joining the wing panels, parts 3.1 - 3.9
Part No. Description Material Dimensions in mm No. off Notes
3.1 Centre rib Plywood 3, die-cut 1
3.2 Receiver battery — Ready made 1 Not included
3.3 Bottom spar Spruce 3 x 7 x 850 1
3.4-3.6 Sheeting Balsa 1.5, die-cut 1 each
3.7 Rib capstrip Balsa 1.5, 6 x 820 8 overlength
3.8 Sheeting Balsa 1.5, die-cut 2
3.9 Top spar Spruce 3 x 7 x 850 1
- Glue the centre rib 3.1 to one wing panel, checking that it is
flush all round.
- Slide the receiver battery 3.2 into place, running the cable out
of the wing.
- The next step is to glue the wing panels together, and this
must be done flat on the building board.
- Pin down the jig strip „HL“ in the central area.
- Temporarily hold the wing panels together over the plan and
trim the central area if necessary to obtain a close fit.
- Glue the wing panels together using white glue, checking
carefully that the ribs meet up neatly, with all edges flush.
- Place the complete wing back on the building board and pin
down the trailing edge. Hold the parts together at the
centreline with clothes pegs and allow the glue to cure
completely.
- Remove the wing from the building board.
- Trim the bottom spar 3.3 to fit and glue it in place flush with
the mainspar 1.2.
- Trim the bottom sheeting panels 3.4 - 3.6 to fit in turn, and
glue them in place. Check that the battery cable and switch
openings are on the same side.
- Trim the rib capstrips 3.7 and the sheeting panel 3.8 to fit as
shown on the plan, and glue them to the structure.
- Locate the marked hole positions in the centre rib and drill
them 4 mm Ø.
- Pin down the wing on the building board again, with the
jig strip „HL“ in place, then trim the top spar 3.9 to fit and
glue it in place.
Stage 4, installing the radio control system, parts 4.1 - 4.12
Part No. Description Material Dimensions in mm No. off Notes
4.1 Webbing Balsa 1.5 x 59 x 800 8
4.2 Servo output arm Plastic Inj. moulded 2 Incl. with 4.3
4.3 Servo — Ready made 2 Not included
4.4 Support Plywood 3, die-cut 1
4.5 Switch — Ready made 1 Not included
4.6 Charge socket holder — Ready made 1 Not included
4.7 Receiver — Ready made Not included
4.8-4.10 Sheeting Balsa 1.5, die-cut 1 each
4.11 Rib capstrip Balsa 1.5 x 6 x 820 8 overlength
4.12 Sheeting Balsa 1.5, die-cut 2
- Glue the webbing pieces 4.1 to the spars 3.3 and 3.9 and the
appropriate ribs as shown on the plan and as described for
parts 2.6. Remove the wing from the building board.
- The next step is to prepare the receiving system. Cut down
the servo output arms 4.2 for the servos 4.3 as shown on the
plan.
- Connect the receiving system components ready to use.
Switch on the transmitter and activate the V-mixer. Note: the
V-mixer must be switched on permanently when the
model is in the air. Check that the transmitter trims are at
centre, so that the servos are at their true neutral.
- Fit the servo output arms on the servos as shown in the plan
view and the detail drawing "X". They must point vertically
down when fitted.
- Fit the output screws to secure the servo output arms.
- Glue the servos in the position shown in the plan view using
a little epoxy. Check that the output arms protrude through
the centre of the slots in the bottom sheeting.
- Glue the support 4.4 to the inside of the sheeting, with the
openings exactly in line.
- Install the switch 4.5 and the charge socket holder 4.6.
- Secure the switch with a drop of epoxy; this allows you to
remove the switch bezel prior to covering the wing.
- Insert the switch harness charge socket in the holder 4.6.
- Connect the entire receiving system, and stick the receiver
4.7 in place with a few drops of epoxy. Keep the glue well
away from the crystal socket.
- Cut small holes in the wingribs for the receiver aerial, and
deploy the flexible aerial along the length of the wing. Apply
a small drop of glue to the end of the aerial to prevent it
slipping out of place.
- Rotate the servo output arms to the rear so that they are out
of the way when you sand and cover the wing.
- Trim the following parts to fit and glue them in place as
described for the underside of the wing: the top sheeting
panels 4.8 - 4.10, the rib capstrips 4.11 and the sheeting 4.12.
- Sand the completed wing overall, taking particular care to
maintain the correct airfoil section at the leading edge.
11
Hot Shot
3078
Building instructions Order No.
Stage 5, winglets and control surfaces, parts 5.1 - 5.12, "S"
Part No. Description Material Dimensions in mm No. off Notes
5.1 Wingtip Plywood 3, die-cut 6
5.2 Winglet Balsa 1.5, die-cut 4
5.3 Sealing piece Plywood 3, die-cut 4
5.4 Screw Steel 3.9 Ø x 16 4
5.5 Control surface Balsa Machined 2
5.6 Adhesive tape Plastic 19 wide - Not included
5.7 Pushrod Steel rod 1.5 x 150 2 One Z-bend
5.8 Horn Plastic Inj. moulded 2
5.9 Pushrod coupler Alu Ready made 2
5.10 Screw Steel M2 x 6 2
5.11 Self-tapping screw Steel 2.2 Ø x 13 4
5.12 Spreader plate Plastic Inj. moulded 2
„S“ Template Plywood 3, die-cut 1
- Glue together parts 5.1 in threes to form the two wingtips,
keeping the edges flush.
- Glue the wingtip assemblies to the wing.
- Remove the pairs of winglets 5.2 from the die-cut sheets and
glue them together with the edges flush.
- Glue together the sealing pieces 5.3 and round them off as
shown in the plan view.
- Glue parts 5.3 to the outside of the winglets, flush with the
bottom edge.
- Drill 2.5 mm Ø holes in the winglets at the punched points,
hold them in position, mark the position of the holes on the
ribs 1.10 and drill them. Drill out the holes in the winglets using
a 4 mm Ø bit.
- Carefully countersink the holes in the sealing pieces using an
8 mm Ø drill held in your hand. Apply thin cyano to the
countersunk areas to harden the wood.
- Offer up the winglets again and fit the screws 5.4 to secure
them to the wing.
- Round off the winglet assemblies neatly as shown on the
plan.
- Cut the control surfaces 5.5 to shape as shown in the plan
view and the cross-sections, trim them as necessary and
plane them to the correct section (A - A) over their entire
length. Sand the planed surfaces smooth to produce the final
airfoil section.
- The wing, winglets and control surfaces can now be covered.
Notes on covering:
- Remember to leave an uncovered strip 6 mm wide either side
of the centreline on the underside of the wing. This provides
a bare wood surface to which the fuselage will be glued later.
- Remove the winglets, cover them separately and then screw
them to the wing again.
- When you have covered the whole model, attach the control
surfaces to the wing using a full-length strip of adhesive tape
5.6 along the top of the pivot line. Apply short strips of tape to
the underside of the hinge to prevent the control surfaces
coming loose.
- Check that both control surfaces move freely up and down,
and that they can move at least as far as the recommended
travels.
- Cut away the covering over the openings for the servo output
arms, the switch, the charge socket and the motor pylon.
- Set the servos to neutral again from the transmitter.
- Connect the pushrods 5.7 to the servo output arms.
- Drill out the linkage holes in the horns 5.8 to 2 mm Ø.
- Mount the pushrod couplers 5.9 on the horns using the
screws 5.10, and check that they rotate freely but with
minimum lost motion.
- Slip the couplers on the free end of the pushrods.
- Place the horns on the control surfaces in the position shown
in the side view and the cross-section on the plan, and drill 2
mm Ø holes for the retaining screws.
- Attach the horns to the control surfaces using the screws 5.11
and spreader plates 5.12. Shorten the screw ends.
- Set up the control surfaces to the correct neutral position
using the template „S“, and tighten the screws 5.10.
Stage 6, fuselage and motor pylon, parts 6.1 - 6.12
Part No. Description Material Dimensions in mm No. off Notes
6.1 Fuselage outside panel Plywood 3, die-cut 2
6.2 Fuselage outside panel Plywood 3, die-cut 2
6.3-6.5 Fuselage core Plywood 3, die-cut 1 each
6.6 Screw Plastic M4 x 2
6.7 Pylon baseplate Plywood 3, die-cut 1
6.8 Captive nut Steel M4 2
6.9 Pylon section, outside Plywood 3, die-cut 2
6.10 Pylon section, core Plywood 3, die-cut 1
6.11 Triangular strip Balsa 15 x 15 x 2
6.12 Towhook Stell 2.4 Ø x 8 x 20 1
12
Hot Shot
3078
Building instructions Order No.
Note: if you intend to install an aero-tow release, remember to
cut the slots "A" and "S" in one of the two fuselage panels 6.1,
6.2 to take the pushrod.
When you have glued the fuselage components together you
can saw out the slot "N" through which the towline is engaged.
To operate the release you will need a servo no larger than mini-
size as space is restricted. The servo can be installed aft of one
of the two standard servos for the control surfaces.
- Glue together the outside fuselage panels 6.1 and 6.2 in pairs
with their edges flush.
- Glue the three core components 6.3 - 6.5 to one outside
panel, aligning the parts by lining up the holes. Glue the
assemblies together with their edges flush.
- Drill out the holes using a 4 mm Ø drill.
- Sand the fuselage to a harmonious shape as shown in the
plan view and the cross-sections. Note that the top face must
be left flat.
- Cover or paint the fuselage, again leaving the top surface (the
joint area) bare and untreated.
- Apply a little oil to the threaded shank of the screws 6.6 to
prevent them becoming stuck. Fit the screws 6.6 through the
wing from the top to act as locators. Glue the fuselage to the
underside of the wing.
- Drill 5.5 mm Ø holes in the motor pylon baseplate 6.7.
- Press the captive nuts 6.8 into the holes and apply a drop of
cyano round the edges to secure them.
- Glue together the three parts 6.9 and 6.10 to form the motor
pylon. Note that the joint surface on the underside must be left
perfectly flat.
- Drill out the holes for the screws 6.6 to 4 mm Ø.
- Oil the threads of the screws 6.6 again lightly. Fit the screws
6.6 from the underside to act as locators for the pylon.
- Glue the complete pylon assembly on the baseplate, and
check that the parts are exactly at right-angles.
- Relieve the triangular strips 6.11 slightly to provide clearance
for the captive nuts, and glue the strips on both sides.
- Sand the completed motor pylon base overall.
- If you decide to use the motor pylon it can be attached to the
model using the screws 6.6. Check that the ailerons are not
obstructed in their movement. If necessary trim the pylon
mount base until you are satisfied.
- Paint the completed pylon mount with fuel-proof lacquer to
prevent it absorbing fuel.
- Note on the motor pylon (robbe Pylon Tank):
- Assemble and install the pylon tank as described in the
instructions supplied with it. Install the glowplug motor and
accessories.
- Disable the throttle barrel.
- Use the spacer sleeve ø 5 x x 6 x 10 mm to mount the propeller
if you need.
- Important: be sure to set the motor thrust line as shown in the
side view on the plan.
- Screw in the towhook 6.12 if you intend using a bungee
system to launch the model.
Balancing
Mark the Centre of Gravity „C.G.“ on the fuselage on both sides
as shown on the plan.
Support the model at the marked points and allow it to hang
freely. Ideally it will balance level with the nose inclined slightly
down.
If the tail hangs down, you will need to add lead ballast to the
nose. If the nose hangs down too far, fit lead ballast at the tail
of the fuselage. In either case the easiest method is to drill a
hole and fill it with lead.
Fix any lead ballast carefully (i.e. glue it in place) so that there
is no chance of it shifting in flight.
Note: the motor pylon is located exactly at the model’s Centre
of Gravity.
This means that you can safely fly the model with or without the
pylon, as the model’s balance will not alter. Provided that you
use the recommended components there is no need to re-
balance the model.
Checking the working systems:
Switch on the RC system and check that all trims on the
transmitter are at neutral (centre).
The control surfaces must now also be at neutral as defined by
the template „S“. Check the setting of the control surfaces
carefully using the template „S“ once more. Adjust the pushrods
if necessary.
The next step is to check the direction of rotation of the servos:
stand behind the model and move the aileron stick to the right.
The trailing edge of the right-hand control surface should now
rise, the left-hand one fall.
Pull the elevator stick back towards you and the trailing edge of
both control surfaces should rise.
If either servo operates in the wrong direction, reverse it using
the servo reverse facility on your transmitter.
Set the control surface travels as stated in the drawing.
13
Hot Shot
3078
Building instructions Order No.
Test flying
The Hot-Shot should be given a test-glide or two before the first
powered flight.
If you have fitted a motor pod, remove it for the test-glide
procedure. This is quite safe, as the pod produces no change
in the model’s CG.
Wait for a day with as little breeze as possible for test-gliding the
Hot-Shot. For the first few flights seek out a large, open field
devoid of obstructions (trees, fences etc.).
Carry out one last check of the working systems.
Grip the glider in one hand at its balance point, with the
transmitter in the other hand. Hold the model level at around
head-height and point it directly into wind.
Trot forward for a few paces and give the model a powerful
launch straight ahead, with the nose slightly above horizontal.
Use the controls if necessary to place the model in a steady,
even glide, and adjust the trims if necessary - flight path „A“.
If the model follows flight path „B“ apply down-elevator to
correct; if the model follows flight path „C“ apply up-elevator to
correct.
If you need to adjust the trims to obtain a flat glide, adjust the
pushrod lengths when the model is back on the ground so that
you can return the transmitter trims to centre; this ensures that
full trim travel is available for subsequent flights.
Repeat the test-glide procedure until you are satisfied that the
model is trimmed correctly, but take care to use the controls as
little as possible while the model is close to the ground.
Once the model is trimmed correctly for the glide you can
confidently fit the power pod and try a powered flight.
Keep well clear of the rotational plane of the propeller when
the motor is running, as the spinning blades can easily
injure you.
Start the motor, adjust it carefully and give the model a powerful
launch exactly into wind, with the nose inclined slightly up.
You may find that you need to apply moderate up-elevator to
prevent the model diving (flight path „C“).
Note that flying wing model aircraft tend to respond more
directly to elevator commands than conventional models, so be
gentle with the elevator stick when correcting the flight path.
Allow the Hot-Shot to fly in a straight line; don’t try to turn it when
it is close to the ground.
Prevent the model climbing at too steep an angle otherwise it
could stall.
Adjust the trims if necessary to produce a steady climb under
power.
Land the model on the glide after the motor has stopped.
robbe Modellsport GmbH & Co. KG
We reserve the right to alter technical specifications.
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3078
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